Feature request: Avoid creating a `~/.pgadmin` directory

[itaranto]

Describe the solution you'd like

PgAdmin4 should use the correct locations for each operating system:

User data:
Windows: %APPDATA%\Local<AppAuthor><AppName>
macOS: ~/Library/Application Support/
Linux: ~/.local/share/

User configuration:
Windows: %APPDATA%\Roaming<AppAuthor><AppName>
macOS: ~/Library/Application Support/
Linux: ~/.config/

Temporary caches:
Windows: %APPDATA%\Local<AppAuthor><AppName>\Cache
macOS: ~/Library/Caches/
Linux: ~/.cache/

This was already proposed in this issue: #3479

Describe alternatives you've considered

N/A

Additional context

N/A